Taiwan Semiconductor Corporation S2KFL

Overview

S2KFL from Taiwan Semiconductor is a 2 A, 800 V standard surface-mount silicon rectifier diode in SOD-123FL package, featuring glass-passivated junction, low reverse leakage (≤5 µA at 25°C), and 40 A surge rating (8.3 ms). It serves as a primary output rectifier in DC–DC converters and switching-mode power supplies.

For engineers reviewing the S2KFL datasheet, S2KFL pinout, S2KFL application, or S2KFL equivalent, key selection criteria include its 800 V repetitive peak reverse voltage, 0.97 V forward voltage at 2 A/25°C, thermal resistance (R_θJA = 116 °C/W), moisture sensitivity level 1 compliance, and SOD-123FL footprint compatibility with automated placement.

Technical Context

The S2KFL is a single-die, unidirectional, planar passivated silicon PN junction rectifier optimized for high-efficiency, medium-voltage switching power conversion. Its design targets stable conduction under continuous 2 A DC load and transient 40 A surges, with junction temperature rated up to +150°C.

Thermal performance is characterized on a 5 mm × 5 mm copper pad PCB per JEDEC standards: R_θJL = 81 °C/W and R_θJC = 69 °C/W confirm effective heat transfer from die to lead and case. Reverse recovery behavior is not specified; it is intended for non-critical soft-recovery applications.

Key Specifications

Pinout & Package

Package: SOD-123FL - Surface-mount, molded plastic case with matte tin-plated leads, UL 94V-0 rated compound, cathode indicated by band, MSL Level 1, weight ≈ 0.016 g.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar rectifier diode applications.

Compared with MURS280T3G and VS-2EYH08-M3/5AT, the S2KFL offers optimal balance of low forward voltage, industry-standard thermal metrics, and cost-effective manufacturability-making it ideal for volume production of mid-power industrial and consumer switching supplies where strict EMI or extreme surge requirements do not dominate.

Availability

S2KFL is available at Aetrix Electronics and suitable for DC–DC converters, switching-mode inverters, and industrial PLC power supplies requiring stable component supply, consistent parametric performance, and long-term production continuity.

Supply support for S2KFL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Taiwan Semiconductor Corporation (TSC) is a vertically integrated analog and discrete semiconductor manufacturer headquartered in Hsinchu, Taiwan, specializing in power rectifiers, TVS diodes, and MOSFETs for industrial and computing markets.

The S2KFL belongs to TSC's S2xFL standard rectifier family, engineered for high-volume, cost-sensitive power conversion applications where reliability, thermal stability, and automated assembly compatibility are prioritized over ultra-fast recovery or ultra-low capacitance.

FAQ

What is the maximum junction temperature rating for the S2KFL?

The S2KFL has a maximum junction temperature (T_J) rating of +150°C, verified per absolute maximum ratings table in the official Taiwan Semiconductor datasheet Version B2103. This allows continuous operation in enclosed industrial enclosures or under sustained load without thermal derating below 2 A, provided PCB thermal design meets R_θJA = 116 °C/W test conditions. The S2KFL maintains full specification compliance across its full −55°C to +150°C junction range.

Does the S2KFL have a specified reverse recovery time (t_rr)?

No, the S2KFL datasheet does not specify reverse recovery time (t_rr) or related parameters such as Q_rr or t_rr waveform characteristics. It is classified as a standard (non-fast or ultrafast) rectifier, intended for applications below 100 kHz switching frequency where soft recovery is acceptable. For high-frequency designs requiring controlled t_rr, engineers should consider alternatives like the MURS280T3G, which explicitly specifies t_rr = 75 ns. The S2KFL remains appropriate for conventional flyback and forward converters.

What is the marking code printed on the S2KFL device body?

The S2KFL is marked with "S2KF" on its top surface, followed by a date code and factory identifier per the official marking diagram in the Taiwan Semiconductor datasheet. This two-character prefix distinguishes it within the S2xFL family (S2DFL = 200 V, S2GFL = 400 V, S2JFL = 600 V, S2KFL = 800 V, S2MFL = 1000 V). No additional functional or lot-specific codes are included in the primary marking; the S2KFL marking is consistent across all production lots.

Is the S2KFL compliant with RoHS and halogen-free standards?

Yes, the S2KFL is fully RoHS compliant and halogen-free per IEC 61249-2-21, as confirmed in the FEATURES section of the Taiwan Semiconductor datasheet Version B2103. The molding compound contains no brominated flame retardants or chlorine-based additives, and lead content is below 1000 ppm. These certifications apply to the completed S2KFL device-not just the die-and are verified through material declarations and third-party testing reports maintained by Taiwan Semiconductor.

What is the surge current rating for the S2KFL at 1.0 ms pulse width?

The S2KFL supports a non-repetitive surge forward current (I_FSM) of 100 A at 1.0 ms pulse width, as specified in the Absolute Maximum Ratings table. This exceeds its 40 A rating at the standard 8.3 ms half-sine waveform, enabling robust handling of brief overloads such as capacitor charging surges or short-circuit events. Engineers must ensure that system-level fusing or current limiting limits exposure to repeated 100 A pulses, as this rating applies only to single-event stress per JEDEC JESD22-A114.